[docs] [issue18612] More elaborate documentation on how list comprehensions and generator expressions relate to each other

[R. David Murray]

R. David Murray added the comment:

Well, it is the case that if you substitute a list comprehension for a generator expression in arbitrary code, most of the time it would work but occasionally it wouldn't, because the runtime behavior is different (lazy production versus all-at-once production).  So yes, the two are not the same thing, and it is important to understand the differences in behavior between them.  Calling a generator expression a list comprehension indicates someone's mental model of how Python works has a couple holes in it, IMO :)

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<http://bugs.python.org/issue18612>
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